Transfers of Financial Assets Servicing Assets at Amortized Cost Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning Balance	$ 19,785	$ 24,403	$ 21,215	$ 25,139
Additions	791	1,038	1,253	2,450
Amortization	(1,864)	(2,100)	(3,756)	(4,248)
Ending Balance	$ 18,712	$ 23,341	$ 18,712	$ 23,341